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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35196d1aa60047eecc0723b9f65634db38957f32833b465e61712b84d748afb2' 
  AND token = 'tlIX1YaLvaxfDtjitnX60/jHlGtQbNCHTvIy0eLVFzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}